Add the bread crumbs, flour, and Old Bay to a mixing bowl and stir together until evenly combined. Set aside.
1 cup panko bread crumbs, 2 tbsp flour, 2 tsp Old Bay seasoning
In another mixing bowl add the egg, onion, bell pepper, mayonnaise, mustard, lemon juice, salt, and pepper. Stir together until evenly combined.
1 large egg, 2 green onions, 1/3 cup finely diced red bell pepper, 2 tbsp mayonnaise, 1 tbsp Dijon mustard, 2 tsp lemon juice, 1/4 tsp salt, 1/4 tsp freshly ground black pepper
Add the crab to the bowl and stir together just until evenly combined- trying not to break the crab up any more than is necessary.
8 oz lump crab meat
Pour the panko crumb mixture into the crab mixture and stir together just until evenly combined.
Using clean hands shape the mixture into four evenly sized round pucks.
Spray the basket of an air fryer with nonstick cooking spray and gently add the cakes making sure they don't touch.
Cook at 375° for 20 minutes, using tongs to gently flip them at the halfway mark. Check for an internal temperature of 145° when done.
Serve warm and enjoy!